Structure of the Atom Quiz - CBSE Class 9 Science

Free practice quiz: Structure of the Atom (CBSE Class 9 Science). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 9 Science practice quiz has 19 multiple-choice questions on Structure of the Atom, and 19 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is the basic building block of matter?

   1. Molecules
   2. Compounds
   3. Elements
   4. Atoms
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   Answer: D. Atoms

   Atoms are the fundamental units that make up all matter.

2. What is the charge of a neutron?

   1. Positive
   2. Negative
   3. Neutral
   4. Variable
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   Answer: C. Neutral

   Neutrons are neutrally charged particles present in the nucleus of an atom.

3. In a neutral atom, the number of electrons is equal to:

   1. Number of protons
   2. Number of neutrons
   3. Atomic mass
   4. Atomic weight
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   Answer: A. Number of protons

   In a neutral atom, the positive charge of the protons is balanced by the negative charge of the electrons.

4. James Chadwick is best known for discovering:

   1. Protons
   2. Neutrons
   3. Electrons
   4. Nucleus
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   Answer: B. Neutrons

   James Chadwick discovered the neutron, a neutrally charged particle in the nucleus.

5. Which type of particle has no electric charge?

   1. Electron
   2. Proton
   3. Neutron
   4. Quark
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   Answer: C. Neutron

   Neutrons are neutral particles found in the nucleus of an atom, having no charge.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following particles has a positive charge?
2. Who proposed the plum pudding model of the atom?
3. Which scientist developed the nuclear model of the atom?
4. The nucleus of an atom is composed of:
5. What does the atomic number represent?
6. Which model of the atom introduced electron orbits?
7. What is the relative mass of an electron?
8. Why did the plum pudding model fail?
9. Which experiment led to the discovery of the electron?
10. The concept of specific energy levels for electrons was introduced by:
11. Which of the following particles is found outside the nucleus?
12. What did the oil drop experiment determine?
13. What does 'isotopes' refer to in atomic structure?
14. Which discovery confirmed the existence of a dense atomic center?

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